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Yes, it's weird. I currently have the Pro plan. I'm doing queries using 200 URLs at the same time with no issues ;). The only limitation is the time: I have to make a query and wait for 10 seconds to perform another This request exceeds the limit allowed by your current plan. Thank you Zach, have a good day!

Cool! I'm glad you figured it out. You can also visit our developer discussion group here: http://seomoz.zendesk.com/forums/293196-developer-discussion-group for more detailed help with the API. Let me know if you have any other questions. Cheers, Joel.